body {
    margin: 0;
    padding: 0;
}

#banner {
    position: relative;/* 缁欑粷瀵瑰畾浣嶄竴涓綅缃弬鑰� */
    width: 895px;
    height: 460px;
     margin: 0 auto;/*涓婁笅 宸﹀彸 */
    /* background-color: #3399ff; */
}
ul{
    list-style-type: none;
    padding: 0;
    margin: 0;
}
#banner .item{
    display: none;
    position: absolute;/*缁濆瀹氫綅锛岃劚绂讳簡鏂囨。娴�*/
    /* 濡傛灉浣犵殑鐖剁骇鍏冪礌 */
    top: 0;
    left: 0;
}
.lr-tab img{ 
    position: absolute;
    top: 200px;
    opacity:0.5;
}
 .lr-tab .zuo-btn{
    left: 0;
    width: 30px;
    height: 50px;
}
.lr-tab .you-btn{
    right: 5px;
    width: 30px;
    height: 50px;
}
.lr-tab img:hover{
    opacity:1;
    cursor: pointer;
}
.tab-btn {
    bottom: 20px;
    right: 50px;
    position: absolute;
    width: 120px;
    height: 30px;
}
.tab-btn .btn{
    float: left;/*宸︽诞鍔�*/
    width: 6px;
    height: 6px;
    background: #868686;
    border-radius: 50%;/*杈规鍦嗚*/
    border: 2px solid #c3c3c3;/*杈规*/
    margin-left: 11px;
}
.tab-btn .btn:hover{
    border-color: #7f7f7f;/*鍗曠嫭璁剧疆杈规棰滆壊*/
    background: #e4e4e4; 
    cursor: pointer;
}

.tab-btn .active{
    border-color: #7f7f7f;
    background: #e4e4e4; 
}